Additional Notes on Marine Pyrenomycetes. 193 
on marine algae. The only Unown genus in that sub-division of the 
Hysteriineae into which it can be placed is Hypoderma, with whose 
characters it agrees very closely in all except the faint yellowing 
observed in some mature ascospores, as opposed to the hyaline or 
colourless ones of the type. However, when one considers the 
absence of standard in the use of these terms, as applied in 
diagnostic descriptions, and also that the spores are hyaline until 
almost perfectly •mature, when the faint yellowing appears, it is 
obvious that there is not sufficient ground for making a generic 
separation. In this connection it is to be regretted that the value 
in classification of slight colour changes has not been thoroughly 
worked out. Until more is done in this direction the systematist 
must inevitably he faced with a distinct difficulty. The uncertainty 
on this point has led to numerous anomalies owing to the latitude 
which is frequently taken advantage of. 
My thanks are due to Professor J. W. H. Trail, F.R.S., and to 
Mr. A. D. Cotton, F.L.S., for helpful suggestions. To the latter I 
am also indebted for Mycosphcerellci material from Clare Island 
which showed Orcadici pelvetiana in addition. 
The continuous supply of material necessary for the completion 
of these notes has been facilitated by a grant from the Government 
Grant Committee of the Royal Society, to whom I wish to express 
my obligations. 
University College, 
Southampton. 
June, 1915. 
ADDITIONAL LITERATURE. 1 
1 Eslee L.M. “ Fungus Galls on Cystoseira and Halidrys." Univ. Cal. Publ., 
Vol. 4, No. 17, 1913. 
2. Patouillard, N. “ Zignoella calospora.” Journal de bot., Vol. 11, 1897. 
3. Patouillard, N., et Hariot, P. “ Une Algae parasite par une Spheriacee.” 
Journ. de bot., Vol. 17, 1903. 
4 Sutherland, G. K. “ New Marine Fungi on Pelvetia." New Phytologist, 
Vol. 14, 1915, (pp. 32-42). 
5 t “ New Marine Pyrenomycetes.” Trans. Brit. Myc. 
Soc. Vol. V, 1914. 
* For other citations see earlier paper in the New Phytologist (4 in the 
list here given). 
